I don't need a source. Despite the obvious benefits of THC, which you can get from smoking marijuana, there is an increased respiratory burden of carbon monoxide and tar than if you smoked an equal number of standard tobacco cigarettes. Which essentially means that marijuana is more carcinogenic than cigarettes.
Therefore, I reiterate, marijuana causes cancer. Just thought I'd throw that out there so you don't kill yourself when you're 50. Get your THC a way that isn't retarded.
Though, considering that people will refuse to stop smoking marijuana, even though they've been warned time and time again, brings about another interesting topic; marijuana is highly addictive.
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